MARS, as seen from the Viking Orbiters in 1977.
The Mariner Valley (Valles Marinaris) is clearly visible.

Mars: Primary characterictics

Diameter ( km )

Mass ( kg x 10^24 )

Density ( kgm^-3 )

Mean Orbit (km x 10^6)

Diurnal Period - day ( hours )

Orbital Period - year ( days )

Orbital Inclination ( ° )

Axial Inclination ( ° )

Average Surf Temperature ( K )

Gravity ( g )

Rel Magnetic Field Strength

MARS

6,794

0.064

3930

228

24.62

687

1.85

25.2

153 to 298

0.38

significant

EARTH

12,756

5.97

5,520

150

24

365.25

nil

23.5

203 to 328

1

1

Mars is smaller than Earth.
Mars is colder than Earth.
Mars has the largest geological features of all the inner planets.
Mars has a thin atmosphere of Carbon Dioxide
Some parts of Mars are heavily cratered.
Mars shows signs of extensive volcanic activity.